Ed, I got the spec straight out of the 1969 Chevrolet Chassis Service Manual. I just double checked the spec in the 1968 Chevrolet Chassis Service Manual, it's the same = 60 ft. lbs. Ed, each of the five bolts also has a heavy duty lock washer on it. I guess if you are still concerned, you could put loctite on each bolt for extra insurance. Also when I have done these in the past, I have tightened them down in a star pattern (like a wheel) in four rounds:1) 30 ft. lbs.2) 45 ft. lbs.3) 60 ft. lbs.4) double check at 60 ft. lbs.

Also for those who are working on the hub/disc assembly, I neglected to mention you need to index (scribe) the hub to the disc before separating these two parts. This is because the hub and disc are balanced as an assembly from the factory. This procedure is also mentioned in the Chassis Service Manual.